Ford 3-Speed Auto

FORD 3-Speed Automatic – Muscle Car / Street Rod / Restoration


The Ford C4 and C6 transmissions are two of the best performing, most durable transmission ever built. By adding a Gear Vendors Under/Overdrive to these transmissions you have an unbeatable package far superior to any factory overdrive automatic and with 6 close ratio gears for performance.

With a 28.6% faster cruising gear your 4.10 rear gears will give you the same net rpm as a set of 3.20s (3.55s will cruise like 2.77s – see Final Drive Ratios. Your engine will turn the same revs it does now in 500 miles but take you 640 miles. Fuel economy will jump 22-28% on a normally aspirated engine and even greater on forced induction powerplants.


With our dash-switch set on “auto” the car will act just like it came factory with the overdrive (like Gms Callaway Corvettes that came factory with the Th400 Gear Vendors). The unit will shift into overdrive without attention of the driver and you can let the wife or whomever drive the vehicle. When you are behind the wheel and want to experience increased performance you will set the dash-switch to manual. This allows you to turn the overdrive on/off at any moment. Leave the line with our red light displayed in AutoLaunch and the vehicle will shift to 1st-over as the engine revs giving you a torque multiplier much stouter than 2nd ie – a3.55 cars 1st-over ratio of 1.92 and a final drive of 6.81 is more torque than a 4.56 rear gear car has in 2nd. Regardless of your rear gear you have never felt this much bark in your car.


After you are revved up in 1st-over move your shifter to 2nd and hit our button on your shifter (we shift out instantly) and you are in 2nd. After you have revved up hit the button for 2nd over (this again is a much closer ratio than 3rd – higher than 4.00 with a 3.55 rear). The close ratio performance, sound and manual like interaction is an absolute blast to drive but most important you are getting this performance from the most reliable, race proven, overdrive on the planet.

The Gear Vendors comes with a 2 year unlimited mileage, unlimited horsepower, unlimited abuse warranty plus a 30 day money back guarantee so you know you will be happy about everything from how it installs, performs, and drives.

Fords installs of our product are the easiest there is to define. Virtually every Ford car 1964 and newer you simply bolt us on without any mods to the tunnel etc. Calls us for all the details. The Gear Vendors is not just the best overdrive you can put in your Ford muscle car or restoration – it represents a tremendous gain in performance, mileage, and fun factor, with higher hp handling than any other overdrive available and installs in just a Saturday morning with regular hand tools. If that sounds too good… there is one downside – it’s not cheap. These are the best and most expensive overdrives you can buy.




Find your transmission and rear gear multiplier below. The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. This Final Drive number is also your torque multiplier when in that gear.

There is not room here to cover all the details so call the factory to discuss the full benefits demonstrated on these charts.


  Axle Ratio
 Trans RatioFinal Drive Ratio


  Axle Ratio
 Trans RatioFinal Drive Ratio


Call or e-mail the factory to find out all the options available in your performance or restoration application. 1-800-999-9555

FORD Application Guide 2-Wheel Drive 3-Speed Automatic